Canon DU-82, Service Manual

Page: 23 / 66

4. Duplex Pick-UP Operation
The duplexing driver turns ON the duplex feed clutch (CL5) after it completes the side registra-
tion adjustment. When the paper size is not A4 (landscape), Letter (landscape) or A5, the
duplexing driver turns OFF the reversing roller release solenoid (SL7) in a specified period of
time after the duplexing unit paper sensor (PS24) detects the leading edge of the paper. It also
turns OFF CL5 in a specified period of time after PS24 detects the leading edge of the paper. The
duplexing driver stops the paper at the duplex pick-up standby position in the printer and waits
for a duplex pick-up command input from the printer.
When the duplexing driver receives a duplex pick-up command from the printer, it controls
the speed of the duplexing unit motor (M8) so that the speed equals the printer's paper feeding
speed. The duplexing driver then turns ON CL5 to feed the paper into the printer.
Figure 2-2-5
2 - 9
CHAPTER 2
Reversing roller (CCW rotation)
Duplex lower guide
Reversing roller
pressure
release plate
Duplex upper guide
Reversing
unit
Duplexing unit
Duplex feed roller 1 Duplex pick-up
sensor lever
Duplex feed
roller 2
Duplexing unit paper sensor